datum plane


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datum plane

,

datum level

or

datum line

n
(Surveying) surveying the horizontal plane from which heights and depths are calculated
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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In the real world, we simulate a primary datum plane such as A, the bottom of the PCB under consideration, by placing the PCB's bottom surface on a surface plate.
Preparing PCB DIMENSIONAL DRAWINGS Using Geometric Dimensioning and Tolerancing: Dimensional acceptability is incumbent on proper use of IPC2615 and ANSI/ASME Y14.5
Parallelism--The condition of a surface, line, or axis which is equidistant at all from a datum plane or axis.
Flatness and parallelism are never synonymous

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